官方API

步驟

最近做一個微信小程式需用到微信運動資料，根據文件，我寫了一個demo；先總結一下步驟，流程簡單如下：

1、呼叫小程式API:wx.login獲取code和sessionKey；
2、呼叫小程式API: wx.getWeRunData獲取微信運動資料（加密的）；
3、解密步驟2的資料；

我後臺用C#的，其實其他語言原理一樣，只有解密資料一個核心方法；

實現程式碼：

前端(小程式的 JS)

const util = require('../../utils/util.js')
Page({
  /**
   * 頁面的初始資料
   */
 

  data: {
      runData:[],
  },

  /**
   * 生命週期函式--監聽頁面載入
   */
  onLoad: function (options) {
    //1、呼叫小程式API:wx.login獲取code和sessionKey；
    var that=this;
    wx.login({
      success: function (resLogin) {
        if (resLogin.code) {
          wx.request({
            url: 'http://localhost:9281/wxapp/onlogin'
 
,
            data: {
              code: resLogin.code
            },
            success: function (resSession) {
                //2、呼叫小程式API: wx.getWeRunData獲取微信運動資料（加密的）；
              wx.getWeRunData({
                success(resRun) {
                  const encryptedData = resRun
                  console.info(resRun);
                  //3、解密步驟2的資料；
 

                  wx.request({
                    url: 'http://localhost:9281/wxapp/decrypt',
                    data: {
                      encryptedData: resRun.encryptedData,
                      iv: resRun.iv,
                      code: resLogin.code
                    },
                    method: 'GET', // OPTIONS, GET, HEAD, POST, PUT, DELETE, TRACE, CONNECT
                    // header: {}, // 設定請求的 header
                    success: function (resDecrypt) {
                      var runData = JSON.parse(resDecrypt.data.data)
                      console.info(runData);
                      if (runData.stepInfoList)
                      {
                        runData.stepInfoList = runData.stepInfoList.reverse()
                        for (var i in runData.stepInfoList)
                        {
                          runData.stepInfoList[i].date = util.formatTime(new Date(runData.stepInfoList[i].timestamp*1000))
                        }
                        that.setData({ runData: runData.stepInfoList });
                      }                      
                    }
                  });
                }
              })
            }
          })
        } else {
          console.log('獲取使用者登入態失敗！' + res.errMsg)
        }
      }
    });
  },
})

後端(c# .net MVC)

//控制器
 public class WxAppController : BaseController
    {

        /// <summary>
        /// 登入，獲取sessionKey，對應上面的http://localhost:9281/wxapp/onlogin
        /// </summary>
        /// <param name="code">code</param>
        /// <returns></returns>
        public ActionResult OnLogin(string code)
        {
            if (string.IsNullOrEmpty(code) == false)
            {
               var sessionKey=  WxAppHelper.GetSessionKey("你的appid", "你的appSecret", code);
                if (string.IsNullOrEmpty(sessionKey) == false)
                {
                    //將sessionKey放入快取，key是code
                    CacheHelper.Set(code, sessionKey, 360); 
                    return WritingSuccess("登入成功");
                }                
            }
            return WritingFailed("登入失敗");
        }

        /// <summary>
        /// 解密，對應上面的http://localhost:9281/wxapp/decrypt
        /// </summary>
        /// <returns></returns>
        public ActionResult Decrypt()
        {
            string code = Request["code"];
            string iv = Request["iv"];
            string encryptedData = Request["encryptedData"];
            string sessionKey = CacheHelper.Get(code); //取出OnLogin的sessionKey
            string rawData = WxAppHelper.AES_decrypt(encryptedData, sessionKey, iv);
            if (string.IsNullOrEmpty(rawData) == false)
            {
                return WritingSuccess("解密成功", rawData);
            }
            return WritingFailed("解密失敗");
        }
//WxAppHelper的GetSession
 public static AppSession GetSession(string appid,string appSecret,string code)
        {
            string api = "https://api.weixin.qq.com/sns/jscode2session?appid={0}&secret={1}&js_code={2}&grant_type=authorization_code";
            string url = string.Format(api, appid, appSecret, code);
            var sessionStr = HttpUtil.Get(url);
            if (string.IsNullOrEmpty(sessionStr) == false)
            {
                return JsonHelper.Json2Object<AppSession>(sessionStr);
            }
            return null;
        }
/// <summary>
        /// AES解密
        /// </summary>
        /// <param name="encryptedDataStr"></param>
        /// <param name="key"></param>
        /// <param name="iv"></param>
        /// <returns></returns>
        public static string  AES_decrypt(string encryptedDataStr, string key, string iv)
        {
            RijndaelManaged rijalg = new RijndaelManaged();
            //-----------------      
            //設定 cipher 格式 AES-128-CBC      

            rijalg.KeySize = 128;

            rijalg.Padding = PaddingMode.PKCS7;
            rijalg.Mode = CipherMode.CBC;

            rijalg.Key = Convert.FromBase64String(key);
            rijalg.IV = Convert.FromBase64String(iv);


            byte[] encryptedData = Convert.FromBase64String(encryptedDataStr);
            //解密      
            ICryptoTransform decryptor = rijalg.CreateDecryptor(rijalg.Key, rijalg.IV);

            string result=null;

            using (MemoryStream msDecrypt = new MemoryStream(encryptedData))
            {
                using (CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read))
                {
                    using (StreamReader srDecrypt = new StreamReader(csDecrypt))
                    {

                        result= srDecrypt.ReadToEnd();
                    }
                }
            }

            return result;
        }
     //實體
    public class AppSession
    {
        public string session_key;
        public int expires_in;
        public string openid;
    }

ok啦，就是這麼簡單，我們看看執行結果：

執行結果

簡單吧~，哪裡寫的不清楚可以留言交流